<p>Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL).Protestors were attacked by dogs and pepper- sprayed when they arrived at the site. (ROBYN BECK/AFP/Getty Images)</p>

Ore. tribes send support to Standing Rock oil pipeline protest

Jackie Many Hides volunteered to carry Oregon's Grand Ronde flag to North Dakota to join the Sioux in their protest against an oil pipeline.

Author:
KGW Staff

Published:
12:22 PM PDT September 5, 2016

Updated:
12:22 PM PDT September 5, 2016

Jackie Many Hides packed her car last week morning with school supplies, food, water and a flag. Her destination: North Dakota.

The state has become a battleground for tribal rights and environmental activists over the installation of the Dakota Access Pipeline.

The Standing Rock Sioux Tribe has sued the U.S. Army Corps of Engineers arguing that the agency acted illegally by taking a "narrow view" of its responsibilities before approving the pipeline, which is expected to carry 470,000 barrels of crude oil per day from North Dakota to Illinois.

A judge is expected to rule on a preliminary injunction by September 9.

<p><span style="color: rgb(26, 26, 26); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; line-height: 18px;">Flags of tribes from the US and Canada line the entrance to an encampment near Cannon Ball, North Dakota where members of the Standing Rock Sioux Tribe and supporters gathered to oppose the Dakota Access Pipeline. ROBYN BECK/AFP/Getty Images)</span></p>

Lamar Armstrong of the Mojave Paiute (R) instructs graduate student Tyesha Ignacio of the Najavo Nation (L) how to prepare donated bison meat in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

A volunteer moves food supplies in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Patrick Davis of the Rosebud Sioux tribe prepares donated bison meat in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

TOPSHOT - Evan Butcher of the Chippewa Tribe plays basketball with younger boys September 4, 2016 at the encampment near Cannon Ball, North Dakota where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline (DAPL) that is slated to transport approximately 470,000 barrels of oil per day from the Bakken Oil Field in North Dakota to refineries in Illinois. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

A youth rides a horse along a fenced off area of land for a new oil pipeline, near Cannon Ball, North Dakota where members of the Standing Rock Sioux tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Dana Yellow Fat of the Standing Rock Sioux tribe welcomes newly arrived supporters at a protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Native Americans march to the site of a sacred burial ground that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline slated to cross the nearby Missouri River, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

A Standing Rock Sioux flag flies over a protest encampment near Cannon Ball, North Dakota where members of the Standing Rock Sioux tribe and their supporters have gathered to voice their opposition to the Dakota Access oil Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

<p>Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL).Protestors were attacked by dogs and pepper- sprayed when they arrived at the site. (ROBYN BECK/AFP/Getty Images)</p>

A Native American protestor wears a shirt reading "My Voice Is My Weapon" at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Marlo Langdeau of the Lower Brule Sioux Tribe joins hundreds of Native Americans for a march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Youths hold signs in English and the Najavo language before the start of a march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

People sign a teepee with words of support for protestors at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Phil Little Thunder Sr attends an evening gathering at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Protestors gather at the blocked entrance to a construction site for the Dakota Access Pipeline to express their opposition to the pipeline, near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's to protest against the construction of the new oil pipeline, near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Native Americans march to a sacred burial ground that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline slated to cross the nearby Missouri River, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Protestors march to a construction site for the Dakota Access Pipeline to express their opposition to the pipeline, at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's to protest against the construction of the new oil pipeline, near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Nantinki Young of the Rosebud Sioux tribe, the head cook supervising all the kitchens poses for a photograph at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Members of the Colorado River Tribes hold a banner to show their support for Native Americans of the Standing Rock reservation who oppose the construction of the Dakota Access Pipeline (DAPL), at the protest camp near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

A protestor leans on a fence blocking access to a construction site for a new oil pipeline near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Jeremy T Prettypaint, 15, of the Crow/Gros Ventre tribe looks on as he sits on a fence blocking access to a construction site a new oil pipeline beside a sign reading "#decolonise" near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Alan Carter, 29, of the Cheyenne River Sioux Tribe is grass dancer garb poses for a photograph at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

01/25

<p><span style="color: rgb(26, 26, 26); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; line-height: 18px;">Flags of tribes from the US and Canada line the entrance to an encampment near Cannon Ball, North Dakota where members of the Standing Rock Sioux Tribe and supporters gathered to oppose the Dakota Access Pipeline. ROBYN BECK/AFP/Getty Images)</span></p>

02/25

Lamar Armstrong of the Mojave Paiute (R) instructs graduate student Tyesha Ignacio of the Najavo Nation (L) how to prepare donated bison meat in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

03/25

A volunteer moves food supplies in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

04/25

Patrick Davis of the Rosebud Sioux tribe prepares donated bison meat in the main kitchen area of the Standing Rock Sioux protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

05/25

TOPSHOT - Evan Butcher of the Chippewa Tribe plays basketball with younger boys September 4, 2016 at the encampment near Cannon Ball, North Dakota where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline (DAPL) that is slated to transport approximately 470,000 barrels of oil per day from the Bakken Oil Field in North Dakota to refineries in Illinois. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

06/25

A youth rides a horse along a fenced off area of land for a new oil pipeline, near Cannon Ball, North Dakota where members of the Standing Rock Sioux tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

07/25

Dana Yellow Fat of the Standing Rock Sioux tribe welcomes newly arrived supporters at a protest encampment near Cannon Ball, North Dakota where members of the tribe and their supporters have gathered to voice their opposition to the Dakota Access Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

08/25

Native Americans march to the site of a sacred burial ground that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline slated to cross the nearby Missouri River, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

09/25

A Standing Rock Sioux flag flies over a protest encampment near Cannon Ball, North Dakota where members of the Standing Rock Sioux tribe and their supporters have gathered to voice their opposition to the Dakota Access oil Pipeline (DAPL), September 3, 2016. Drive on a state highway along the Missouri River, amid the rolling hills and wide prairies of North Dakota, and you'll come across a makeshift camp of Native Americans -- united by a common cause. Members of some 200 tribes have gathered here, many raising tribal flags that flap in the unforgiving wind. Some have been here since April, their numbers fluctuating between hundreds and thousands, in an unprecedented show of joint resistance to the nearly 1,200 mile-long Dakota Access oil pipeline. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

10/25

<p>Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL).Protestors were attacked by dogs and pepper- sprayed when they arrived at the site. (ROBYN BECK/AFP/Getty Images)</p>

11/25

A Native American protestor wears a shirt reading "My Voice Is My Weapon" at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

12/25

Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

13/25

Marlo Langdeau of the Lower Brule Sioux Tribe joins hundreds of Native Americans for a march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

14/25

Youths hold signs in English and the Najavo language before the start of a march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

15/25

People sign a teepee with words of support for protestors at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

16/25

Phil Little Thunder Sr attends an evening gathering at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

17/25

Protestors gather at the blocked entrance to a construction site for the Dakota Access Pipeline to express their opposition to the pipeline, near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's to protest against the construction of the new oil pipeline, near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

18/25

Native Americans march to a sacred burial ground that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline slated to cross the nearby Missouri River, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

19/25

Protestors march to a construction site for the Dakota Access Pipeline to express their opposition to the pipeline, at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's to protest against the construction of the new oil pipeline, near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

20/25

Nantinki Young of the Rosebud Sioux tribe, the head cook supervising all the kitchens poses for a photograph at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

21/25

Members of the Colorado River Tribes hold a banner to show their support for Native Americans of the Standing Rock reservation who oppose the construction of the Dakota Access Pipeline (DAPL), at the protest camp near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

22/25

A protestor leans on a fence blocking access to a construction site for a new oil pipeline near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

23/25

Native Americans march to a burial ground sacred site that was disturbed by bulldozers building the Dakota Access Pipeline (DAPL), near the encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the oil pipeline that is slated to cross the Missouri River nearby, September 4, 2016 near Cannon Ball, North Dakota. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

24/25

Jeremy T Prettypaint, 15, of the Crow/Gros Ventre tribe looks on as he sits on a fence blocking access to a construction site a new oil pipeline beside a sign reading "#decolonise" near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

25/25

Alan Carter, 29, of the Cheyenne River Sioux Tribe is grass dancer garb poses for a photograph at an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest against the construction of the Dakota Access Pipe (DAPL), near Cannon Ball, North Dakota, on September 3, 2016. The Indian reservation in North Dakota is the site of the largest gathering of Native Americans in more than 100 years. Indigenous people from across the US are living in camps on the Standing Rock reservation as they protest the construction of the new oil pipeline which they fear will destroy their water supply. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Many Hides volunteered to carry Oregon's Grand Ronde flag to North Dakota to join the Sioux in their protest. The tribe has staged a sit-in on the border of its reservation, which runs along the path of the pipeline.

"I think it's something that's decided personally," said Grand Ronde Tribal Councilman Jack Giffin. "Some people have a lot of concern for other tribes and some think we should take care of our own tribe. I personally think it should be a priority to help."

The Sioux Tribe has asked both tribal members and non-tribal members to contact their congressional representatives to voice opposition to the pipeline.

"This is another chapter in the long history of the federal government granting the construction of potentially hazardous projects near or through tribal lands, waters, and cultural places without including the tribe," the tribe's website reads. "The current proposed pipeline route crosses under Lake Oahe, just a half mile up from the Standing Rock Sioux Reservation."

Tribes from more than 20 states have sent letters and resolutions of support including Washington, Montana, South Dakota and Nevada. Support has also come from tribes in Quebec, British Columbia and Puerto Rico.

At least three tribes from Oregon have sent letters and supplies to North Dakota including the Siletz and Burns-Paiute tribes.

"The peaceful protest of the Dakota Pipeline by tribal people has been met by the incarceration of tribal leaders, blockage of services and inability to access needed services," Burns-Paiute Council Chair Charlotte Rodrique wrote in the tribe's letter of support. "This is certainly in contrast to how the armed militia that overtook the Malheur Wildlife last winter was treated. They were allowed to come and go as they wanted, shop at local stores, deface federal buildings and intimidate local people."

Indian Affairs Acting Assistant Secretary Lawrence Roberts issued a statement in March asking the U.S. Army Corps of Engineers to examine the potential impacts of the pipeline to the reservation. The Department of the Interior currently holds 800,000 acres of land in trust for the Sioux that Roberts said could be effected by an oil leak or spill originating from the pipeline.

Earthjustice, which has an office in Seattle, is representing the Sioux tribe and said the motion for a preliminary injunction requested that construction be halted until a survey of the land can be completed to assess the cultural and heritage resources in the area.

Jan Hasselman, an Earthjustice attorney on the case said, "What’s happening on the ground at Standing Rock is so much bigger than any one lawsuit. Tribes are coming together in a way that hasn't happened in a century. Collectively, they are serving notice on this nation that they have had enough of paying the price for someone else’s prosperity.”

Dakota Access, managing the construction of the pipeline, said on its website that it would take caution around wetland and culturally important sites.

The pipeline is expected to generate 800-12,000 local jobs and $129 million in annual property and income tax